SSDs are extra-fast disks without any moving parts, which makes them very quiet and suitable for system and application installation. They come in handy if you are building a new PC, but SSDs can also replace the HDDs in older computers, significantly speeding up the whole system. See below for a short explanation about the SSD formats.

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Format

Interface

Max. speed*

Designation

2.5"

SATA III

600 MB/s

Desktops and notebooks

M.2

SATA III

Desktops, notebooks, tablets, mini PCs, etc.(future-proof connectors)

NVMe

4000 MB/s

U.2

NVMe

mSATA

SATA III

600 MB/s

Tablets and slim notebooks

PCI-Express x4

PCI-Express

4000 MB/s

Desktops and servers

SATA DOM

SATA III and USB

600 MB/s

Portable storage (super-fast flash drives)

*The listed maximum speed is only theoretical; the real speed tends to be lower depending on the disk type, disk controller, or the type of data you are transferring. One large file transfers faster than a folder full of smaller files.

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The capacity (size) of the hard disk determines how much data the disc can accommodate.

Width

8 mm (0.8 cm)

238.76 mm (23.88 cm)

Height

2.23 mm (0.22 cm)

149.86 mm (14.99 cm)

Depth

1.5 mm (0.15 cm)

168 mm (16.8 cm)

External interface

Thunderbolt (2)

Determines the way in which the hard drive is connected to the computer, namely the type of connector through which the drive connects to the device. Each type of connection is unique, and in most cases these connections are not interchangeable.

Internal interface

SATA II (1)

SATA III (72)

PCIe (20)

mSATA (3)

M.2 (SATA) (22)

M.2 (NVMe) (42)

U.2 (5)

Determines the way in which the hard drive is connected to the computer, namely the type of connector through which the drive connects to the device. Each type of connection is unique, and in most cases these connections are not interchangeable.

Read Speed

1.6 MB/s

6,800 MB/s

Memory cache

256 MB

2 GB

Write speed

1.4 MB/s

6,000 MB/s

HDD rotational speed

7,200 RPM (1)

Different hard drives spin at different rates. Simply put, the faster the drive can spin, the faster the reading mechanism manages to read (store) information.